CN216245698U - Heat exchanger of variable cross-section spiral coil pipe - Google Patents
Heat exchanger of variable cross-section spiral coil pipe Download PDFInfo
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- CN216245698U CN216245698U CN202121421490.4U CN202121421490U CN216245698U CN 216245698 U CN216245698 U CN 216245698U CN 202121421490 U CN202121421490 U CN 202121421490U CN 216245698 U CN216245698 U CN 216245698U
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- 239000000571 coke Substances 0.000 claims description 14
- 230000008859 change Effects 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 16
- 230000006872 improvement Effects 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 16
- 238000000034 method Methods 0.000 description 9
- 239000003638 chemical reducing agent Substances 0.000 description 7
- 239000003245 coal Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000001174 ascending effect Effects 0.000 description 4
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- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 238000004939 coking Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000011280 coal tar Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- PMVSDNDAUGGCCE-TYYBGVCCSA-L Ferrous fumarate Chemical compound [Fe+2].[O-]C(=O)\C=C\C([O-])=O PMVSDNDAUGGCCE-TYYBGVCCSA-L 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
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Abstract
The utility model provides a heat exchanger of a variable cross-section spiral coil, which comprises an outer cylinder, an inner cylinder and a spiral heat exchange tube, wherein the spiral heat exchange tube is arranged between the outer cylinder and the inner cylinder; the spiral heat exchange pipe is a spiral coil pipe with a variable cross-section structure and comprises at least one reducing pipe structure with the pipe inner diameter being increased. The heat exchanger is economical, and saves production cost. Meanwhile, in the aspect of technical improvement, the variable-section spiral coil is used as a steam-water circulation heat exchange tube, so that the steam-water flow is effectively improved, the steam-water flow resistance is reduced, and the power consumption of the circulating pump is reduced.
Description
Technical Field
The utility model belongs to the technical field of electric equipment for recovering waste heat of raw coke oven gas, and particularly relates to a heat exchanger of a spiral coil with a variable cross section.
Background
The coke oven can perform high-temperature dry distillation treatment on coal, and efficiently convert the coal into products such as coke, coke oven gas, coal tar, crude benzene and the like, thereby being an efficient energy conversion kiln. In the coke oven waste heat, the heat brought out by the crude gas at 650-700 ℃ accounts for about 36%, and the method has extremely high recycling value. At present, the industrial application of raw coke oven gas is usually realized by adopting a cooling treatment process, and the traditional process comprises the following steps: spraying a large amount of 70-75 ℃ circulating ammonia water on the high-temperature raw gas to cool the high-temperature raw gas and realize waste heat recovery, however, the high-temperature raw gas brings heat and is wasted due to the evaporation of a large amount of circulating ammonia water
In the 80 s of the 20 th century, most of the coke plants in japan used conduction oil for riser recovery of raw gas to bring out heat: the riser is made into a jacketed pipe, heat transfer oil exchanges heat with high-temperature raw coke oven gas through the jacketed pipe, and the heated high-temperature heat transfer oil can be used for multiple purposes, such as ammonia distillation, coal tar distillation, dried coal as fired and the like. Later, Ji Steel had performed similar tests on five-hole risers; wu Steel, horse Steel, saddle Steel, ripple Steel, Beijing coking plant, Shenyang gas two plants, Ben Steel one iron, Flat topping coal plant and other enterprises used water vaporization cooling technology to recover the heat in the riser; in addition, enterprises also adopt a method of indirect heat exchange with high-temperature raw coke oven gas by taking nitrogen as a medium.
However, the above various methods have more or less the following problems: the structure design of the heat transfer process is unreasonable, the circulation is not smooth enough, tar on the side wall surface of the raw gas blocks the raw gas channel, heat transfer oil cokes blocks the heat transfer oil channel, or the problem of expansion with heat and contraction with cold in the processes of starting, stopping and running can not be solved effectively, so that the method is difficult to implement successfully or realize satisfactory effect. Especially because the temperature of the raw gas in the ascending pipe changes periodically and intermittently in the stages of coal charging, coking, heat preservation and coke discharging in the whole coking period.
Because the medium that uses in most heat exchangers at present is water, and the medium export is steam-water mixture under this condition, because the inner tube wall expends with heat and contracts with cold very obviously, the inner tube wall extrusion other structures after expending with heat and contract with cold lead to the inner tube wall fragile, must change whole heat exchanger.
Disclosure of Invention
In order to solve the technical problem that the heat exchanger is replaced in an integral mode economically and consider that steam is far less than the density of water, the steam quantity of medium water is continuously increased in the heat absorption boiling process, the volume is continuously expanded, the flow speed in the coil pipe is continuously increased, meanwhile, steam bubbles are continuously generated on the inner wall of the pipe due to boiling, and the spiral coil pipe vibrates due to steam bubble impact, breakage, flow obstruction, steam blockage and the like in a steam-water mixture, so that the spiral coil pipe and a solid heat conduction bath layer fall off and separate, even the coil pipe is damaged; the spiral heat exchange pipe is a spiral coil pipe with a variable cross-section structure and comprises at least one reducing pipe structure with the pipe inner diameter being increased.
As an improvement, the ratio of the inner diameter of the spiral heat exchange tube after diameter change to the inner diameter of the spiral heat exchange tube before diameter change is 1: 1.01 to 1.5.
As another improvement, the inner diameter of the spiral heat exchange tube changes more than twice, and the inner diameter of the spiral heat exchange tube changes in a mode of increasing progressively in sequence.
As another improvement, the heat conduction layer is arranged between the outer barrel and the inner barrel, and the spiral heat exchange tube is buried in the heat conduction layer.
As another improvement, the thickness of the heat conducting layer is changed synchronously along with the change of the inner diameter of the pipe of the spiral heat exchange pipe.
As another improvement, the reducing pipe structure is changed from a round pipe into a conical surface pipe structure expanded along the central axis of the reducing pipe, wherein the outer side wall of one side of the spiral heat exchange pipe behind the reducing pipe is tightly attached to the outer wall of the inner cylinder, the outer surface of the other side of the spiral heat exchange pipe forms a conical surface structure, and the included angle between the conical surface of the reducing rear pipe and the central line of the reducing front pipe is 1-15 degrees.
As another improvement, the spiral heat exchange tube further comprises an outer cylinder, an inlet end and an outlet end, wherein the inlet end and the outlet end are independently arranged at the upper end and/or the lower end of the outer cylinder, and the ports are independently communicated with one end of the spiral heat exchange tube; the diameter of the spiral heat exchange tube communicated with the inlet end is smaller than that of the spiral heat exchange tube communicated with the outlet end.
As another improvement, the device also comprises an upper flange, a lower flange, an outer cylinder body and a gap layer; the upper end of the inner cylinder is fixedly connected with the upper end of the outer cylinder through an upper flange, and the lower end of the inner cylinder is fixedly connected with the lower end of the outer cylinder through a lower flange; a clearance layer is arranged between the outer surface of the inner cylinder and the inner surface of the outer cylinder.
As another improvement, the device also comprises a straight fin which is fixedly arranged on the inner side wall of the inner cylinder body and faces to one side of the raw coke oven gas channel.
As another improvement, the leakage detection pipe is fixedly arranged on the side wall of the outer cylinder body and communicated with the gap layer.
Has the advantages that: compared with the conventional method that the whole heat exchanger needs to be replaced, the device provided by the utility model has the advantages that the production cost is saved from the economical point of view. Meanwhile, in the aspect of technical improvement, the variable-section spiral coil is used as a steam-water circulation heat exchange tube, so that the steam-water flow is effectively improved, the steam-water flow resistance is reduced, and the power consumption of the circulating pump is reduced.
Drawings
Fig. 1 is a schematic structural view of an evaporator according to embodiment 1.
FIG. 2 is a schematic view of a cross-sectional structure of a reducing portion of the reducer pipe according to the present invention.
FIG. 3 is a schematic view of the structure of a superheater according to embodiment 2.
In the figure: the heat exchanger comprises an upper flange 1, a lower flange 2, an inlet end 3, an outlet end 4, an inner cylinder 5, an outer cylinder 6, a gap layer 7, a spiral heat exchange tube 8, a heat conduction layer 10, straight fins 11, a leakage detection tube 12, a first reducer 13, a second reducer 14, a third reducer 131, a fourth reducer 141, a first section 9, a second section 15, a third section 16, a third reducer 131 and a fourth reducer 141.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.
The heat exchanger of the variable cross-section spiral coil comprises an outer cylinder 6, an inner cylinder 5 and a spiral heat exchange tube 8, wherein the spiral heat exchange tube 8 is arranged between the outer cylinder 6 and the inner cylinder 5; the spiral heat exchange tube 8 is a spiral coil with a variable cross-section structure and comprises at least one group of reducing tube structures with the inner diameters being increased.
The inner diameter ratio of the spiral heat exchange tube 8 after diameter change to the spiral heat exchange tube 8 before diameter change is 1: 1.01 to 1.5.
The inner diameter of the pipe of the spiral heat exchange pipe 8 is changed more than twice, and the inner diameter of the pipe of the spiral heat exchange pipe 8 is changed in a mode of increasing progressively in sequence.
Still include the heat-conducting layer 10, the heat-conducting layer 10 sets up between outer barrel 6, interior barrel 5, and spiral heat exchange tube 8 is buried in heat-conducting layer 10.
The thickness of the heat conducting layer 10 changes synchronously with the change of the inner diameter of the pipe of the spiral heat exchange pipe 8.
The reducing pipe structure is changed from a round pipe into a conical surface pipe structure expanded along the central axis of the reducing pipe, wherein the outer side wall of one side of the spiral heat exchange pipe 8 behind the reducing pipe is tightly attached to the outer wall of the inner cylinder 5, the outer surface of the other side of the spiral heat exchange pipe forms a conical surface structure, and the included angle between the conical surface of the reducing rear pipe and the central line of the reducing front pipe is 1-15 degrees.
The heat exchanger also comprises an outer cylinder 6, an inlet end 3 and an outlet end 4, wherein the inlet end 3 and the outlet end 4 are independently arranged at the upper end and the lower end of the outer cylinder 6, and the ports are independently communicated with one end of a spiral heat exchange tube 8; the diameter of the spiral heat exchange tube 8 communicated with the inlet end 3 is smaller than that of the spiral heat exchange tube 8 communicated with the outlet end 4.
The device also comprises an upper flange 1, a lower flange 2, an outer cylinder 6 and a gap layer 7; the upper end of the inner cylinder 5 is fixedly connected with the upper end of the outer cylinder 6 through an upper flange 1, and the lower end of the inner cylinder is fixedly connected with the lower end of the outer cylinder 6 through a lower flange 2; a gap layer 7 is arranged between the outer surface of the inner cylinder 5 and the inner surface of the outer cylinder 6.
The device also comprises a straight fin 11 which is fixedly arranged on the inner side wall of the inner cylinder 5 and faces one side of the raw coke oven gas channel.
The leakage detecting pipe 12 is fixedly arranged on the side wall of the outer cylinder 6 and communicated with the gap layer 7.
The utility model is illustrated in the following by means of a specific example.
Example 1
The ascending tube evaporator is an application form of a heat exchanger, as shown in fig. 1, in this example, an outlet end 4 is a steam-water mixture outlet and is arranged at the upper end of an outer cylinder 6, an inlet end 3 is a water inlet and is arranged at the lower end of the outer cylinder 6, the number of times of increasing the inner diameter of a heat exchange tube 8 is 2, the heat exchange tube respectively comprises a first reducing tube 13 and a second reducing tube 14, wherein the diameter of the front end of the second reducing tube 14 is the same as the diameter of the first reducing tube 13 after reducing, and the specific section of the inner cylinder 5 through the reducing tubes is shown, the size of the section after reducing is increased, the diameters of a first section 9, a second section 15 and a third section 16 are gradually increased, so that the steam-water flow can be effectively improved, the steam-water flow resistance is also reduced, and the power consumption of a circulating pump is reduced.
Example 2
The superheater of the ascending pipe is an application form of a heat exchanger, as shown in fig. 3, in this example, the outlet end 4 is an superheated steam outlet and is arranged at the lower end of the outer cylinder 6, the inlet end 3 is an superheated steam inlet, the inlet end 3 is arranged at the upper end of the outer cylinder 6, the number of times of reduction of the inner diameter of the heat exchange pipe is 2, and the superheater of the ascending pipe comprises a third reducing pipe 131 and a fourth reducing pipe 141, respectively, wherein the diameter of the front end of the second reducing pipe 141 is the same as the diameter of the third reducing pipe 131 after being reduced, and specifically, as can be seen from the section of the inner cylinder 5 through the reducing pipes, the size of the section after being reduced is increased, and the diameters of the section four 91, the section five 151 and the section six 161 are gradually increased.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. The utility model provides a heat exchanger of variable cross section spiral coil which characterized in that: the heat exchanger comprises an outer cylinder (6), an inner cylinder (5) and a spiral heat exchange tube (8), wherein the spiral heat exchange tube (8) is arranged between the outer cylinder (6) and the inner cylinder (5); the spiral heat exchange tube (8) is a spiral coil with a variable cross-section structure and comprises at least one reducing tube structure with the inner diameter of the tube being increased; the inner diameter of the spiral heat exchange tube (8) changes more than twice, and the inner diameter of the spiral heat exchange tube (8) changes in a mode of increasing progressively in sequence.
2. A variable cross-section spiral coil heat exchanger as claimed in claim 1, wherein: the inner diameter ratio of the spiral heat exchange tube (8) after diameter change to the inner diameter ratio of the spiral heat exchange tube (8) before diameter change is 1: 1.01 to 1.5.
3. A heat exchanger in accordance with claim 1 wherein: still include heat-conducting layer (10), heat-conducting layer (10) set up between outer barrel (6), interior barrel (5), spiral heat exchange tube (8) are buried in heat-conducting layer (10).
4. A heat exchanger of variable cross-section helical coil according to claim 3, wherein: the thickness of the heat conduction layer (10) changes synchronously along with the change of the inner diameter of the pipe of the spiral heat exchange pipe (8).
5. A heat exchanger in accordance with claim 1 wherein: the reducing pipe structure is changed from a round pipe into a conical surface pipe structure expanded along the central axis of the reducing pipe, wherein the outer side wall of one side of the spiral heat exchange pipe (8) behind the reducing pipe is tightly attached to the outer wall of the inner cylinder body (5), the outer surface of the other side of the spiral heat exchange pipe forms a conical surface structure, and the included angle between the conical surface of the reducing rear pipe and the central line of the reducing front pipe is 1-15 degrees.
6. A heat exchanger in accordance with claim 1 wherein: the heat exchanger also comprises an outer cylinder (6), an inlet end (3) and an outlet end (4), wherein the inlet end (3) and the outlet end (4) are independently arranged at the upper end and/or the lower end of the outer cylinder (6), and the ports are independently communicated with one end of a spiral heat exchange tube (8); the diameter of the spiral heat exchange tube (8) communicated with the inlet end (3) is small than that of the spiral heat exchange tube (8) communicated with the outlet end (4).
7. The heat exchanger of variable cross-section helical coil of claim 6, wherein: the device also comprises an upper flange (1), a lower flange (2), an outer cylinder body (6) and a gap layer (7); the upper end of the inner cylinder (5) is fixedly connected with the upper end of the outer cylinder (6) through an upper flange (1), and the lower end of the inner cylinder is fixedly connected with the lower end of the outer cylinder (6) through a lower flange (2); a clearance layer (7) is arranged between the outer surface of the inner cylinder body (5) and the inner surface of the outer cylinder body (6).
8. A heat exchanger in accordance with claim 1 wherein: the device also comprises a straight fin (11) which is fixedly arranged on the inner side wall of the inner cylinder (5) and faces one side of the raw coke oven gas channel.
9. The heat exchanger of variable cross-section helical coil of claim 6, wherein: the leakage detection device also comprises a leakage detection pipe (12) which is fixedly arranged on the side wall of the outer cylinder body (6) and communicated with the clearance layer (7).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120852777 | 2021-04-23 | ||
| CN2021208527776 | 2021-04-23 |
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| Publication Number | Publication Date |
|---|---|
| CN216245698U true CN216245698U (en) | 2022-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121421490.4U Active CN216245698U (en) | 2021-04-23 | 2021-06-24 | Heat exchanger of variable cross-section spiral coil pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116697327A (en) * | 2023-07-07 | 2023-09-05 | 哈尔滨汽轮机厂有限责任公司 | Direct-current evaporator and fused salt heat storage and release system for coal-fired power generation |
-
2021
- 2021-06-24 CN CN202121421490.4U patent/CN216245698U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116697327A (en) * | 2023-07-07 | 2023-09-05 | 哈尔滨汽轮机厂有限责任公司 | Direct-current evaporator and fused salt heat storage and release system for coal-fired power generation |
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